Strong's #4727: stenazo (pronounced sten-ad'-zo)
 from 4728; to make (intransitively, be) in straits, i.e. (by implication) to sigh, murmur, pray inaudibly:--with grief, groan, grudge, sigh.
Thayer's Greek Lexicon:
 ́ 
 
  stenazō 
 
 1) a sigh, to groan
 
  Part of Speech: verb
Relation: from G4728
  Citing in TDNT: 7:600, 1076
 
Usage:
This word is used 6 times:
Mark 7:34: "looking up to heaven,  he sighed, and saith unto him, Ephphatha,"
Romans 8:23: "even we ourselves  groan within ourselves, waiting for the adoption,"
2 Corinthians 5:2: "in this we  groan, earnestly desiring to be clothed upon with our house"
2 Corinthians 5:4: "we that are in this tabernacle  do groan, being burdened: not for that"
Hebrews 13:17: "joy, and not  with grief: for that is unprofitable for you."
James 5:9: " Grudge not one against another, brethren, lest ye be condemned: behold,"